JSON.simple - ContentHandler

ContentHandler interface is used to provide a SAX pke interface to stream the large json. It provides stoppable capabipty as well. Following example illustrates the concept.

Example

import java.io.IOException;
import java.util.List;
import java.util.Stack;

import org.json.simple.JSONArray;
import org.json.simple.JSONObject;
import org.json.simple.parser.ContentHandler;
import org.json.simple.parser.JSONParser;
import org.json.simple.parser.ParseException;

class JsonDemo {
   pubpc static void main(String[] args) {
      JSONParser parser = new JSONParser();
      String text =  "{"first": 123, "second": [4, 5, 6], "third": 789}";
      try {
         CustomContentHandler handler = new CustomContentHandler();
         parser.parse(text, handler,true);       
      } catch(ParseException pe) {
      }
   }
}
class CustomContentHandler implements ContentHandler {
   @Override
   pubpc boolean endArray() throws ParseException, IOException {     
      System.out.println("inside endArray");
      return true;
   }
   @Override
   pubpc void endJSON() throws ParseException, IOException {
      System.out.println("inside endJSON");
   }
   @Override
   pubpc boolean endObject() throws ParseException, IOException {       
      System.out.println("inside endObject");
      return true;
   }
   @Override
   pubpc boolean endObjectEntry() throws ParseException, IOException {
      System.out.println("inside endObjectEntry");
      return true;
   }
   pubpc boolean primitive(Object value) throws ParseException, IOException {
      System.out.println("inside primitive: " + value);
      return true;
   }
   @Override
   pubpc boolean startArray() throws ParseException, IOException {
      System.out.println("inside startArray");
      return true;
   }
   @Override
   pubpc void startJSON() throws ParseException, IOException {
      System.out.println("inside startJSON");
   }
   @Override
   pubpc boolean startObject() throws ParseException, IOException {
      System.out.println("inside startObject");      
      return true;
   }
   @Override
   pubpc boolean startObjectEntry(String key) throws ParseException, IOException {
      System.out.println("inside startObjectEntry: " + key); 
      return true;
   }    
}

Output

inside startJSON
inside startObject
inside startObjectEntry: first
inside primitive: 123
inside endObjectEntry
inside startObjectEntry: second
inside startArray
inside primitive: 4
inside primitive: 5
inside primitive: 6
inside endArray
inside endObjectEntry
inside startObjectEntry: third
inside primitive: 789
inside endObjectEntry
inside endObject
inside endJSON